{"id":5994,"date":"2026-09-11T08:25:48","date_gmt":"2026-09-11T08:25:48","guid":{"rendered":"https:\/\/www.batteriesfast.co.uk\/blogs\/?p=5994"},"modified":"2026-09-11T08:25:49","modified_gmt":"2026-09-11T08:25:49","slug":"garmin-fenix-5s-smartwatch-battery-three-year-battery-degradation-and-replacement-plan","status":"publish","type":"post","link":"https:\/\/www.batteriesfast.co.uk\/blogs\/archives\/5994","title":{"rendered":"Garmin Fenix \u200b\u200b5S Smartwatch Battery: Three-Year Battery Degradation and Replacement Plan"},"content":{"rendered":"\n

The Garmin Fenix \u200b\u200b5S uses a built-in Garmin Fenix \u200b\u200b5S Smart Watch Battery<\/a><\/u><\/strong> (model 361-00096-00) with a nominal capacity of approximately 150mAh (some third-party batteries list it as 225mAh). It operates at 3.7V, with a total energy of approximately 0.56Wh, and is a lithium-ion rechargeable battery.<\/p>\n\n\n\n

Official Garmin Fenix \u200b\u200b5S Battery Life<\/p>\n\n\n\n

The Garmin Fenix \u200b\u200b5S watch boasts the following Garmin Fenix \u200b\u200b5S Smart Watch Battery<\/a><\/u><\/strong> life: up to approximately 9 days in smartwatch mode, approximately 12 hours in GPS training mode, approximately 28 hours in UltraTrac power-saving mode, and approximately 14 hours with wrist heart rate monitoring enabled in GPS mode. Actual battery life is affected by screen brightness, sensor activation status, and satellite positioning frequency.<\/p>\n\n\n\n

Battery Life Degradation<\/p>\n\n\n\n

After approximately 3 years of normal use, the Garmin Fenix \u200b\u200b5S Smart Watch Battery<\/a><\/u><\/strong> life of the Garmin Fenix \u200b\u200b5S watch will noticeably decrease. Some users have reported that a Fenix \u200b\u200b5S that had been used for several years ran out of power at around 18 miles (29 kilometers) during a marathon training session. Since the Fenix \u200b\u200b5 series is discontinued, official battery replacement services for the Garmin Fenix \u200b\u200b5S watch may no longer be provided, and users will usually need to handle this themselves.<\/p>\n\n\n\n

Replacement Solution<\/p>\n\n\n\n

Replacing the Garmin Fenix \u200b\u200b5S watch battery is relatively easy and does not require soldering. The only tools needed are a T6 screwdriver and a plastic pry bar. Steps: Remove the four screws on the back, open the back cover, disconnect the old battery connector, insert the new battery and reconnect it, and finally tighten the screws back on.<\/p>\n\n\n\n

Garmin Fenix \u200b\u200b5S Watch Battery Maintenance Recommendations<\/p>\n\n\n\n

Charge the Garmin Fenix \u200b\u200b5S Smart Watch Battery<\/a><\/u><\/strong>when it drops to 20%-30%, instead of charging it to 100% every time.<\/p>\n\n\n\n

Avoid charging in high-temperature environments.<\/p>\n\n\n\n

When not wearing the Garmin Fenix \u200b\u200b5S watch for extended periods, maintain the battery level between 40% and 60% and store it in a cool, dry place.<\/p>\n\n\n\n

Avoid over-discharging, as this may cause irreversible damage.<\/p>\n\n\n\n

In summary, although the Garmin Fenix \u200b\u200b5S watch has a small battery capacity, it achieves long battery life through low power consumption. Consider replacing the Garmin Fenix \u200b\u200b5S Smart Watch Battery<\/a><\/u><\/strong> after approximately three years of use. Third-party solutions are inexpensive, and DIY replacement is also feasible.<\/p>\n\n\n\n

3.8V 150mAh Replacement Smart Watch Battery for Garmin 361-00096-00<\/a><\/u><\/strong><\/p>\n\n\n\n

Upgrade your Garmin Fenix 5S 361-00096-00 with the high-performance 150mAh 361-00096-00 battery<\/a>, engineered with advanced circuit board technology to deliver exceptional performance and extended usage for your Garmin Fenix 5S 361-00096-00. Designed for reliability and longevity, this battery ensures your device stays powered throughout the day.
“Find the best Garmin Smart Watch Battery price! Search Batteriesfast.co.uk for Garmin Smart Watch Battery<\/a><\/strong>. Get fast shipping and top-rated customer service.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Garmin Fenix \u200b\u200b5S uses a built-in Garmin Fenix \u200b\u200b5S Smart Watch Battery (model 361-00096-00) with a nominal capacity of approximately 150mAh (some third-party batteries list it as 225mAh). It operates at 3.7V, with a total energy of approximately 0.56Wh, and is a lithium-ion rechargeable battery. Official Garmin Fenix \u200b\u200b5S Battery Life The Garmin Fenix \u200b\u200b5S watch […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5994","post","type-post","status-publish","format-standard","hentry","category-news"],"yoast_head":"\nGarmin Fenix \u200b\u200b5S Smartwatch Battery: Three-Year Battery Degradation and Replacement Plan - Batteries Fast Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.batteriesfast.co.uk\/blogs\/archives\/5994\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Garmin Fenix \u200b\u200b5S Smartwatch Battery: Three-Year Battery Degradation and Replacement Plan - Batteries Fast Blog\" \/>\n<meta property=\"og:description\" content=\"The Garmin Fenix \u200b\u200b5S uses a built-in Garmin Fenix \u200b\u200b5S Smart Watch Battery (model 361-00096-00) with a nominal capacity of approximately 150mAh (some third-party batteries list it as 225mAh). It operates at 3.7V, with a total energy of approximately 0.56Wh, and is a lithium-ion rechargeable battery. 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